Ink for silk-screen printing and corresponding printing technique

ABSTRACT

The present invention relates to inks for silk-screen printing technique, as well as the corresponding printing technique, designed to bestow upon the reproduction obtained by means of the use of said inks on an appropriate substrate, preferably of a paper type, a particular feel, preferably a particular roughness or coarseness. In particular, the present invention relates to an ink for silk-screen printing of catalogues or advertising leaflets for products designed for decorative wall coatings that will reproduce also the feel of the final decoration applied on the wall substrate.

FIELD OF THE INVENTION

The present invention relates to inks for silk-screen printing, as wellas the corresponding printing technique, designed to bestow upon thereproduction obtained by means of the use of said inks on an appropriatesubstrate, preferably of a paper type, a particular feel, preferably aparticular roughness/coarseness.

BACKGROUND ART

Silk-screen printing is a printing process which uses a form—referred toas frame or sieve—constituted by a fabric with a very fine mesh, whichis left permeable to the ink in the areas of image to be reproduced andimpermeable in the other areas.

The frame is formed by a network that can be made with threads ofpolyester, nylon or steel stretched over iron or aluminium frames ofvariable size at a tension of 4-7 bar with a more or less fine meshaccording to the chromatic effect that it is desired to obtain, andbears the form of the pattern to be reproduced. Frames normally used forsilk-screen printing have a woof that can range from 10 to 150threads/cm² according to the type of ink or paint product used and theamount thereof to be released onto the substrate.

Preparation of the frame can be performed manually by tracing thereonwith a lithographic crayon the pattern that it is intended to reproduce.This closes with its trace the underlying layers between the woof andthe warp. Next, with a special glue, all the spaces not involved in thepattern are closed, and then, using a solvent (alcohol or benzene), allof the thick trace of the crayon is removed, exposing the holes that hadbeen occluded. Preparation of the frame can also be performedmechanically, in particular photomechanically.

Printing may be manual or carried out using special machines. In thefirst case, the ink is distributed using a spatula, referred to asdoctor blade or doctor knife, over the sieve stretched over theappropriate frame.

The doctor blade, in fact, by applying pressure as it slides from oneend to the other of the frame causes passage through the network of theink on the substrate that is to be printed. The average thickness of dryink deposited for each pass is between 50 and 100 μm.

The machinery used for silk-screen printing is substantially made up ofsurfaces that apply suction pressure and/or that use special glueseither in line or rotating on a carousel with one to eight colours andintermediate drying hoods with IR or UV lamps or hot-air lamps. Saiddrying devices may moreover be equipped with travelling bands or beltsof the length necessary for polymerization of the ink of the paintproduct used or can carry out manual drying on frames, which can be seton top of one another. This machinery may moreover be equipped with asheet-in/sheet-out device.

The silk-screen printing system is used generally for printing offabrics, packaging made of paper, aluminium or plastic materials, roadsigns and also in the decoration of furniture, crockery and toys.

Printing inks are generally formed by a dyeing part and by a bindingpart. The dyeing part can be obtained with pigments and with solubledyes, where by “pigment” is meant an insoluble coloured compound in thebinder of the ink, whilst by “soluble dye” is meant a coloured compoundthat is soluble in the binder. In turn, the binder is constituted by avehicle, a modifier of the vehicle, and a solvent.

The typical composition of an ink is given in Table 1. TABLE 1 Dyeingpart Binding part Pigment Soluble dye Vehicle Modifier Solvent Organic(transparent) Natural Plastifiers Aliphatic (transparent) resins Waxescompounds Oils Aromatic Inorganic Synthetic Wetting agents compounds(covering) resins Stabilizing agents Ketones Anti-foaming Esters agentsWater Drying agents

The dyeing part determines the chromatic characteristics of the ink. Theorganic pigments are characterized by a good transparency, with theexception of carbon black, which is semi-covering, and fluorescentpigments which are covering.

The inorganic pigments possess high covering-power characteristics withthe exception of some colours that are transparent (iron blue) orsemi-covering (china clay, calcium carbonate, aluminium hydrate). Thesoluble dyes are, instead, characterized by a very high transparency.

The intensity of the colours is adjusted with covering or transparentthick white inks.

The binding part of a printing ink is constituted, as has been seen, bya vehicle, a modifier, and a solvent.

The vehicle is constituted basically by natural or synthetic resins thatbestow upon the ink fundamental characteristics from thechemico-physical standpoint.

Natural resins have had a considerable importance in the formulation ofprinting inks. Currently, the tendency is, however, to replace them withresins of a synthetic type.

Synthetic resins can be used by themselves or mixed together, and, in afew cases, also mixed with natural resins, should there exist a gooddegree of compatibility, where by “compatibility” is meant thepossibility for two or more resins to form a homogeneous and stablesolution that does not give rise over time to phenomena of separation,precipitation, or clouding.

The main resins used are resins of an epoxy, vinyl, hydrocarbon,nitro-cellulose, maleic, melamine, phenol-formaldehyde,urea-formaldehyde, alkyd, polyester, acrylate, or polyurethane type.

Modifiers are used to bestow upon the inks particular characteristics,such as for example plasticity, flexibility, mechanical surfaceresistance, etc. Esters of phthalic, sebacic and glycolic acids aregenerally used as plastifiers; as regards waxes, natural ones, such asfor example carnauba wax, or synthetic ones, for example polyethylene,are used; as regards oils, linseed, soya and wood oils may be used;finally, as dessicators the salts of manganese, zinc, cobalt andzirconium of naphthene, octoic and linoresinic acids are used.

The solvents have an extremely important dual function: they must bestowupon the ink the fluidity necessary for enabling transfer from theprinting form (sieve or frame) to the substrate, and must moreoverconstitute the mobile phase of the ink-drying process, i.e., thecomponent that must be removed either by penetration or by evaporationor by selective filtration at the moment of application of the ink onthe substrate.

The film of ink that remains on the material has a constant thickness,in all cases much greater than that of the typographic and lithographicprocesses; as a result it achieves much greater covering-power effects.This enables prints with high resistance to light and to chemical agentsto be obtained. Furthermore, the system does not call for high printingpressures that are necessary in other processes.

SUMMARY OF THE INVENTION

The purpose of the present invention is the development of inks forsilk-screen printing on a substrate, preferably but not exclusively of apaper type, which will be capable of bestowing upon the reproductionthus obtained a particular feel of coarseness/roughness and thickness.

The present invention relates more preferably to an ink for silk-screenprinting on the paper substrate of catalogues or advertising leaflets,for products designed for decorative wall coatings, which, in additionto reproducing the colours and decorative effects (typical also ofcatalogues commonly on sale), reproduces in an innovative way the feel(coarseness, roughness, thickness) of the final decoration applied onthe wall substrate.

An evident advantage of this invention is linked to the fact that it ispossible to evaluate, in addition to the colours and to the decorativeeffects, also the real impact and effective response of the decorativeproduct applied on the wall surface to be decorated, thus facilitatingthe choice on the part of the consumer of the colour and of the desiredeffect.

Said purpose is achieved through a careful choice and just the rightproportion of the different components of the silk-screen printing ink,in particular through the addition to the main components of thesilk-screen printing ink of mineral fillers, preferably silica, ofappropriate grain size, aimed at bestowing upon the silk-screen printingink as printed on a substrate, preferably of a paper type, the feel ofcoarseness and roughness that the basic paint product will have onceapplied on a wall substrate.

The ink for silk-screen printing forming the subject of the presentinvention can be vinyl-based, either shiny or matte, either transparentor covering, in colours pigmented with liquid pigments ormetallic-effect pigments. The ink may moreover be fluorescent,phosphorescent, metallic, or with an embossed or thickened effect.

According to the invention, the above purpose is achieved thanks to thesolution referred to specifically in the ensuing claims.

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

The invention will now be described in detail in relation to a preferredexample of embodiment—preparation of a catalogue for decorative wallproducts—purely by way of non-limiting examples.

EXAMPLE 1 Ink for Silk-Screen Printing Reproducing the Catalogue“Antiche Terre Fiorentine 2”

Starting from a pre-printed card with typographic printing in thecolours and decorations required, a silk-screen printing process isadopted for the purpose of bestowing the desired effect (shiny or matte)and of roughness, in particular by adding to the silk-screen printingink having a base of mineral fillers, preferably quartz (silica) flour,of different grain size, which, mixed with the other components of theink, yield the feel of roughness proper to the plasters of wallsurfaces.

Optionally, additives and/or solvents designed to retard drying of theink and/or to adjust its viscosity during the application process can beused.

In Table 2 there appears the formulation of an ink for silk-screenprinting to obtain a shiny effect (all of the formulations areunderstood as being expressed in parts by weight). TABLE 2 Quantity(parts by Component weight) Transparent shiny ink from 97.7 to 88 Dryingretardant from 0.5 to 10 Quartz flour 71 μm from 0.9 to 6 Quartz flour100 μm from 0.9 to 6 Solvent for adjusting viscosity up to 100

Amongst the components of the transparent shiny ink, formaldehyde may,for example, be cited. The solvents contained in the transparent shinyink can be chosen from the group constituted by isobutane,methoxypropanol, methoxypropyl acetate, toluene, ethyl benzene andxylene. The binders consist basically of polyacrylates.

Amongst the components of the drying retardant, it is possible to citediisopropyl ether, methoxypropanol, aliphatic hydrocarbons with up to 10carbon atoms, hydroxymethylpentanone, diisoheptyl phthalate anddiisononyl phthalate. The binders are basically constituted bypolyacrylates.

The mineral fillers used herein and designated as quartz flour aresubstantially made up of silica SiO₂ with the presence, to a lesserdegree (almost to the level of impurity) of other compounds, such asAl₂O₃, Fe₂O₃, etc.

Amongst the components of the solvent for adjusting viscosity, thefollowing may be cited:

-   -   1-methyl-2-methoxyethyl acetate;    -   naphtha solvent from oil 100;    -   1-methoxy-2 propanol; and    -   cyclohexanone.

The formulation to obtain the matte effect is given in Table 3. TABLE 3Quantity (parts by Component weight) Transparent matte ink from 97.7 to88 Drying retardant from 0.5 to 10 Quartz flour 71 μm from 0.9 to 6Quartz flour 100 μm from 0.9 to 6 Solvent for adjusting viscosity up to100

Amongst the components of the transparent matte ink, it is possible tocite the following solvents:

-   -   diacetone alcohol;    -   1,2,4 trimethylbenzene;    -   1-methyl-2-methoxyethyl acetate;    -   solvent naphtha from oil 100;    -   xylene;    -   mesitylene; and    -   propylbenzene.

The binders are basically constituted by polymethylmethacrylate.

The formulation of Table 2 or Table 3 is applied on the card thatfunctions as a substrate already printed typographically in the requiredcolours.

For the above purpose, a silk-screen printing frame made of polyesterfabric or steel is used. The fabric of the frame can present a woof thatis finer or denser (from 10 to 150 threads/cm²) according to what typeof ink it is intended to deposit on the substrate card. In the specificcase, it can preferably be characterized by a density of 32 threads/cm²up to 110 threads/cm².

Once the inking mixture has been applied on the pre-printed card, thisis passed (both for the shiny effect and for the matte effect) in theoven for drying. The temperature of the oven can range from 50° C. to85° C. according to the amount of drying retardant used and for a timethat can range from 1 minute to 2 minutes 30 seconds.

The procedure previously described can be repeated a number of timesaccording to the desired effect. By increasing in fact the number ofpasses there are obtained different shades of colour, thicknesses, androughness.

EXAMPLE 2 Ink for Silk-Screen Printing Reproducing the Catalogue“Antiche Terre Fiorentine Iridescenti e Metallico Gold e Silver”

In order to obtain this catalogue, neutral cards are used. The purpose,as has already been seen, is to obtain colours and decorations (flecks)accompanied by tactile effects of roughness and coarseness as far aspossible corresponding to reality, reproducing the decorative finishobtainable on a wall surface.

The non-coloured neutral card is initially printed by silk-screenprinting in order to obtain the base.

For the above purpose, the formulation appearing in Table 4 is used (thecolour will be different according to the pigment used). TABLE 4Quantity (parts by Component weight) Water up to 100 Sodiumhexamethaphosphate from 0.1 to 0.5 Anti-foaming agent from 0.1 to 0.5Thickener from 0.2 to 0.9 Preserving agent from 0.7 to 2.5 Wetting agentfrom 0.2 to 1.1 Pigment from 2 to 10 Calcium carbonate from 19 to 48Calcined china clay from 0.5 to 8 Propylene glycol from 1 to 6Coalescent from 0.3 to 1.5 Versatic vinyl emulsion from 5 to 20 inaqueous phase 2-amino-2-methyl-1-propanol from 0.1 to 0.5 Quartz flourfrom 1 to 10 Colouring toner from 10 to 20 (different for each colour inthe catalogue)

The formulation of Table 4 is used for spreading out and printing theiridescent base. This composition is spread over the first frame for thefirst printing pass. In the second pass, a composition that will printthe first white fleck attenuated in the colour will be used (Table 5).The next pass will print (with an appropriate formulation reproduced inTable 6) the more intense and definite white fleck in the colour. Thefourth and final printing pass will impart on the card substrate themetallic or iridescent effect and the feel of roughness (ink appearingin Table 7).

The four printing passes are set apart from one another by the exposureof the card treated with fast drying using IR lamps and a final dryingin an oven, the temperature of which may range from 50° C. to 85° C.

The formulation of the ink designed to print the whitest fleckattenuated in the colour is the one given below (Table 5). TABLE 5Quantity Component (parts by weight) Water up to 100 Sodiumhexamethaphosphate from 0.1 to 0.5 Cellulose thickener from 0.5 to 2Wetting agent from 0.1 to 0.5 Dispersing agent from 0.05 to 0.3Anti-foaming agent from 0.05 to 0.3 Coalescent from 0.4 to 1.2 Hexyleneglycol from 1 to 7.5 Propylene glycol from 0.05 to 0.5 Ethylene glycolfrom 0.05 to 1.5 Acrylic emulsion from 10 to 25 in aqueous phaseSilicone anti-foaming agent from 0.2 to 0.5 2-Amino-2-methyl-1-propanolfrom 0.05 to 1 Preserving agent from 0.15 to 0.5 Pigment from 3 to 10Calcined china clay from 1 to 5 Talcum from 1 to 5 Brown pigment from0.005 to 0.008 Yellow pigment from 0.008 to 0.030 Black pigment to 0.002to 0.008 Thickener from 0.200 to 0.700

The formulation of the ink designed to print the white fleck that ismost intense in the tonality of tint is given below in Table 6. TABLE 6Quantity Component (parts by weight) Water up to 100 Sodiumhexamethaphosphate from 0.200 to 1 Cellulose thickener from 0.200 to 1.5Wetting agent from 0.500 to 1.5 Dispersing agent from 0.010 to 0.2Anti-foaming agent from 0.100 to 0.5 Coalescent from 0.300 to 1.2Hexylene glycol from 1 to 3 Propylene glycol from 0.100 to 1.5 Ethyleneglycol from 0.200 to 0.8 Acrylic emulsion from 10 to 25 in aqueous phaseSilicone anti-foaming agent from 0.100 to 0.72-amido-2-methyl-1-propanol from 0.050 to 0.5 Preserving agent from0.400 to 1.3 Pigment from 15 to 30 Calcined china clay from 5 to 12Talcum from 1 to 9 Brown pigment from 0.004 to 0.01 Yellow pigment from0.004 to 0.01 Thickener from 0.050 to 1

To obtain the iridescent effect (in six different tonalities of tintaccording to the particular pigment used) or metallic effect (gold,silver, etc.) and at the same time to bestow upon the catalogue thetypical effect of the roughness and thickness of the wall to bedecorated, recourse is had to the formulation given in Table 7. TABLE 7Quantity Component (parts by weight) Water up to 100 Sodiumhexamethaphosphate from 0.05 to 0.5 Cellulose thickener from 1 to 1.9Wetting agent from 0.05 to 0.5 Dispersing agent from 0.05 to 0.4Anti-foaming agent from 0.1 to 0.6 Coalescent from 0.3 to 1.5 Hexyleneglycol from 1 to 8 Acrylic emulsion from 12 to 30 in aqueous phaseSilicone anti-foaming agent from 0.1 to 0.5 Thickener from 0.1 to 0.72-amino-2-methyl-1-propanol from 0.05 to 0.4 Preserving agent from 0.2to 1 Pigment with iridescent or from 5 to 15 metallic effect Quartzflour 71 μm from 1 to 6 Quartz flour 100 μm from 1 to 6

At the end of these four passes of silk-screen printing, the card willbe subjected to a passage in the oven for final drying. The temperatureof the oven may range from 50° C. to 85° C. for a period of time from 1minute to 2 minutes 30 seconds.

EXAMPLE 3 Ink for Silk-Screen Printing Reproducing the Catalogue of“Antiche Terre Fiorentine Perlescenti”

In order to obtain this particular catalogue, non-pre-printed neutralcards are used.

The non-coloured neutral card is printed by silk-screen printing inorder to obtain the base.

For said purpose, the general formulation of Table 8 (the colour will bedifferent for the six catalogue colours, and this will be obtained byvarying the pigments within the formulation) is used. TABLE 8 Quantity(parts by Component weight) Water up to 100 Sodium hexamethaphosphatefrom 0.1 to 0.5 Anti-foaming agent from 0.1 to 0.7 Thickener from 0.3 to1 Preserving agent from 0.2 to 0.8 Wetting agent from 0.1 to 0.5 Pigmentfrom 3 to 18 Calcium carbonate from 20 to 40 Calcined china clay from 2to 5 Propylene glycol from 0.5 to 2.5 Coalescent from 0.5 to 1.5 Dimmerfrom 0.5 to 5 Acrylic emulsion from 8 to 20 in aqueous phase Mouldrepellent from 0.5 to 1 2-amino-2-methyl-1-propanol from 0.1 to 0.5Quartz flour 100 μm from 5 to 15

This formulation will be spread on a first frame for a first pass ofsilk-screen printing so as to produce the card with the base in thedesired colour. In the second pass of silk-screen printing, an ink willbe provided for the printing of the fleck type attenuated in the colour(Table 9), and subsequently in a third pass the iridescent/pearly effectwill be created, and the required effect of roughness will be provided(Table 10). The last pass will use a formulation designed to print themore intense fleck that is defined in the colour (Table 11).

The four printing passes are set apart from one another by exposure ofthe treated cards to fast drying using infrared lamps and to a finaldrying in the oven, the temperature of which may range from 50° C. to85° C.

The formulation of the printing ink for production of the fleckattenuated in the colour is given in Table 9. TABLE 9 Quantity (parts byComponent weight) Water up to 100 Sodium hexamethaphosphate from 0.1 to0.6 Preserving agent from 0.2 to 0.6 Anti-foaming agent from 0.1 to 0.5Cellulose thickener from 0.2 to 1.2 Wetting agent from 0.2 to 0.6Dispersing agent from 0.01 to 0.2 Silicone anti-foaming agent from 0.05to 0.2 Coalescent from 0.5 to 1.5 Hexylene glycol from 0.6 to 1.5Acrylic emulsion from 5 to 15 in aqueous phase Thickener from 0.05 to0.9 2-amino-2-methyl-1-propanol from 0.1 to 0.4 Pigment from 7 to 20Calcium carbonate from 15 to 35 Calcined china clay from 2 to 7Propylene glycol from 0.4 to 1.5 Dimmer from 0.5 to 2 Vinylic emulsionfrom 4 to 10 in aqueous phase Mould repellent from 0.5 to 1 Ethyleneglycol from 0.1 to 0.8 Talcum from 1 to 5 Quartz flour 100 μm from 2 to8

The iridescent/pearly effect in the six different tonalities of tintaccording to the particular pigment employed will be obtained using theink the formulation of which is given in Table 10. TABLE 10 Quantity(parts by Component weight) Water up to 100 Sodium hexamethaphosphatefrom 0.05 to 0.5 Cellulose thickener from 1 to 1.9 Wetting agent from0.05 to 0.5 Dispersing agent from 0.05 to 0.4 Anti-foaming agent from0.1 to 0.6 Coalescent from 0.3 to 1.5 Hexylene glycol from 1 to 8Acrylic emulsion from 12 to 30 in aqueous phase Silicone anti-foamingagent from 0.1 to 0.5 Thickener from 0.1 to 0.72-amino-2-methyl-1-propanol from 0.05 to 0.4 Preserving agent from 0.2to 1 Pigment with from 5 to 15 iridescent or metallic effect Quartzflour 71 μm from 1 to 6 Quartz flour 100 μm from 1 to 6

During this printing step, the typical effect of roughness and thicknesswill moreover have already been bestowed upon the wall surface to beplastered, by using quartz flour with a different grain size.

The formulation of the ink for printing the fleck of intense anddefinite colour is given in Table 11. TABLE 11 Quantity Component (partsby weight) Neutral paste from 90 to 99.9 Pigments from 10 to 0.1

Amongst the solvents contained in the neutral paste, it is possible tocite benzene, toluene, ethyl benzene, xylene, aliphatic hydrocarbonswith up to 8 carbon atoms, and alkyl benzenes. The binders contained inthe neutral paste are basically constituted by polyacrylates.

The pigments vary in the tints and in the amounts according to thecolours that it is desired to reproduce.

At the end of these four passes, the card that has thus undergonesilk-screen printing is subjected to a further pass for final drying for1 minute to 2 minutes 30 seconds.

EXAMPLE 4 Ink for Silk-Screen Printing Reproducing the Catalogue “Ori eArgenti”

Starting from the card pre-printed with typographic printing in thecolours and decorations required, silk-screen printing will be carriedout with two distinct passes, with inks specially designed for thepurpose of reproducing the effect both of desired colouring and ofdesired roughness.

The decoration “Ori e Argenti” is present in two variants, namely in thegold variant and in the silver variant.

The formulation used in the first pass of silk-screen printing both forthe gold effect and for the silver effect is given in Table 12. TABLE 12Quantity Component (parts by weight) Transparent matte ink from 99.5 to90 Drying retardant from 0.5 to 10 Quartz flour 71 μm from 1 to 6 Quartzflour 100 μm from 1 to 6 Solvent for adjusting viscosity up to 100

The quartz flours of different grain size that are present in themixture of the inks provide the feel of roughness proper to plasters andwall surfaces. It is also possible to use additives and solventsdesigned to retard the drying of the ink and in particular the viscosityduring the time of application.

In the next pass of silk-screen printing, the gold variant will bedifferentiated from the silver one. The formulation of the printing inkdesigned to print the gold variant is given in Table 13. TABLE 13Quantity Component (parts by weight) Water up to 100 Sodiumhexamethaphosphate from 0.100 to 0.500 Cellulose thickener from 0.700 to1.900 Wetting agent from 0.100 to 0.600 Dispersing agent from 0.050 to0.300 Silicone anti-foaming agent from 0.3 to 1 Coalescent from 0.300 to2 Hexylene glycol from 1 to 8 Acrylic emulsion from 10 to 30 in aqueousphase Thickener from 0.100 to 1.500 2-amino-2-methyl-1-propanol from0.100 to 0.600 Preserving agent from 0.200 to 1 Pigment with gold metaleffect from 2 to 10

The silver variant will have the same formulation and will vary only inthe choice of the pigment with metallic effect, which in this case willhave a silver metal effect.

Also in this case, at the end of the two printing passes, the card willbe subjected to a pass in the oven for a final drying at a temperatureof between 50° C. and 85° C. and for a period of between 1 minute and 2minutes 30 seconds.

Of course, without prejudice to the principle of the invention, thedetails of implementation and the embodiments may vary widely withrespect to what is described and illustrated herein purely by way bfexample, without thereby departing from the sphere of protection of thepresent invention.

1. An ink for silk-screen printing, wherein said ink bestows upon thereproduction obtained by means of use of said ink roughness, coarsenessand/or thickness.
 2. The ink for silk-screen printing according to claim1, wherein said ink comprises mineral fillers.
 3. The ink according toclaim 2, wherein said mineral fillers are constituted substantially bysilica.
 4. The ink according to claim 2, wherein said mineral fillershave a grain size of between approximately 50 μm and approximately 200μm.
 5. The ink according to claim 4, wherein said grain size ispreferably between approximately 70 μm and approximately 100 μm.
 6. Theink according to claim 2, wherein said mineral fillers have a grain sizeless than 250 μm.
 7. The ink according to claim 2, wherein said mineralfillers have a grain size preferably less than 150 μm.
 8. The inkaccording to claim 2, wherein said mineral fillers are present in anamount comprised in a range from approximately 0.01 to approximately 20parts by weight.
 9. The ink according to claim 2, wherein said mineralfillers are present in an amount preferably comprised in a range fromapproximately 0.09 to approximately 10 parts by weight.
 10. The inkaccording to claim 2, wherein to said mineral fillers is associated abinding part.
 11. The ink according to claim 10, wherein said bindingpart is constituted by at least one vehicle, at least one modifier andat least one solvent.
 12. The ink according to claim 11, wherein saidvehicle is selected from among the group constituted by vinyl, acrylate,polyurethane, epoxy, nitro-cellulose, maleic, polyester, melamine,phenol-formaldehyde, urea-formaldehyde, and alkyd-resins.
 13. The inkaccording to claim 12, wherein said vehicle is constituted by vinylresins.
 14. The ink according to claim 12, wherein said vehicle isconstituted by acrylate resins.
 15. The ink according to claim 11,wherein said modifier is selected from among the group constituted byphthalic, sebacic and glycolic acids and their derivatives, linseedoils, soya oils, wood oils, carnauba wax, polyethylene waxes, salts ofmanganese, zinc, cobalt and zirconium of naphthene, octoic, linoresinicacids, and coalescent agents.
 16. The ink according to claim 15, whereinsaid modifier is constituted by esters of phthalic acids.
 17. The inkaccording to claim 15, wherein said modifier is constituted by acoalescent agent.
 18. The ink according to claim 11, wherein saidsolvent is selected from among the group constituted by water, aliphatichydrocarbons with up to 10 carbon atoms, isobutane, alkyl benzenes,methoxypropanol, hydroxymethylpentanone, methoxypropyl acetate, benzene,toluene, ethyl benzene, xylene, and diisopropyl ether.
 19. The inkaccording to claim 18, wherein said solvent is constituted by water. 20.The ink according to claim 18, wherein said solvent is constituted bymethoxypropanol.
 21. The ink according to claim 10, wherein said bindingpart is constituted by vinyl resins, phthalic acids, and water.
 22. Theink according to claim 10, wherein said binding part is constituted byacrylate resins, coalescent agent, and methoxypropanol.
 23. The inkaccording to claim 10, wherein said binding part is present in an amountcomprised in a range from approximately 99.9 to approximately 5 parts byweight.
 24. The ink according to claim 1, wherein the reproductionobtained by means of the use of said ink has a coarseness of between 50μm and 250 μm.
 25. The ink according to claim 1, wherein said coarsenessis less than 250 μm.
 26. A technique of silk-screen printing, wherein itcomprises the use of an ink according to any one of claim
 1. 27. Thetechnique of silk-screen printing according to claim 26, wherein saidtechnique deposits on a printing substrate an average thickness of inkbetween approximately 50 μm and approximately 100 μm at each printingpass.
 28. The technique of silk-screen printing according to claim 26,wherein said technique envisages at least two printing passes.
 29. Thetechnique of silk-screen printing according to claim 26, wherein saidtechnique envisages a number of printing passes less than ten.
 30. Thetechnique of silk-screen printing according to claim 26, wherein saidtechnique bestows upon the reproduction a coarseness of between 50 μmand 250 μm.
 31. The technique of silk-screen printing according to claim26, wherein said technique bestows upon the reproduction a coarseness ofless than 250 μm.
 32. The technique of silk-screen printing according toclaim 26, wherein said technique bestows upon the reproduction acoarseness preferably less than 150 μm.
 33. The silk-screen printingtechnique according to claim 26, wherein said technique bestows upon thereproduction a thickness of between 200 μm and 900 μm.
 34. Thesilk-screen printing technique according to claim 26, wherein saidtechnique bestows upon the reproduction a thickness of preferably lessthan 800 μm.
 35. Leaflet, wherein it is printed using an ink accordingto any claim 1.